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Summary of Significant Accounting Policies - Impacts of Revisions to the Company’s Condensed Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues $ 529,405 $ 573,751 $ 1,105,137 $ 1,047,563
Total operating expenses 457,557 818,379 979,923 1,179,206
Net loss attributable to Oasis $ 42,757 $ (320,204) $ (72,125) $ (319,614)
Basic (in dollars per share)   $ (1.02) $ (0.23) $ (1.06)
Diluted (in dollars per share)   $ (1.02) $ (0.23) $ (1.06)
As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   $ 501,337   $ 922,553
Total operating expenses   745,965   1,054,196
Net loss attributable to Oasis   $ (320,204)   $ (319,614)
Basic (in dollars per share) $ 0.14 $ (1.02)   $ (1.06)
Diluted (in dollars per share) $ 0.14 $ (1.02)   $ (1.06)
Revision        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   $ 72,414   $ 125,010
Total operating expenses   72,414   125,010
Net loss attributable to Oasis   $ 0   $ 0
Basic (in dollars per share)   $ 0   $ 0
Diluted (in dollars per share)   $ 0   $ 0
Oil and gas revenues        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues $ 357,004 $ 397,849 $ 725,786 $ 764,444
Oil and gas revenues | As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   395,921   759,592
Oil and gas revenues | Revision        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   1,928   4,852
Purchased oil and gas        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues 109,389 128,064 257,860 195,773
Purchased oil and gas expenses $ 109,662 129,579 $ 259,566 200,173
Purchased oil and gas | As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   57,578   75,615
Purchased oil and gas expenses   57,165   75,163
Purchased oil and gas | Revision        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   70,486   120,158
Purchased oil and gas expenses   $ 72,414   $ 125,010